Baffle for furnaces



Patented Aug. 29, 1933 BAFFLE FOR FURNACES John W. Franz, St. Louis,,Mo., assigner ofy one? half to Lawrence J. Rasse, Fairbury, NebraskaApplication May 9, 1932. serial N. 610,214

1 claim. (c1. 11o-97) My invention has relation toimprovements incombination baffles and regenerators for furnaces, particularly furnacesfor home heating, and it consists in the novel features. of constructionmore fully set forth in the specification and pointed out in the claim.

Many home heating furnaces are designed to burn solid fuel, such as coalor coke, hence their lconstruction is such that ample .time shall beprovided for the combustion of the volatiles and that adequate draftmaybe admitted to the combustion chamber for the same purpose. Whenthese furnaces are equipped with liquid fuel burners and no otheralterations are made in the furnace their eiliciency is extremely lowand much of the heat produced is lost by escaping through the flue.

I have overcome this lack of eiliciency by providing a horizontal bailleWithin the combustion chamber on which a regenerator checker-work isdisposed and at the same time have provided a damper for operationwithin the furnace dome f whereby the draft may vbe adjusted to theproper v degree to permit complete combustion of the fuel, and at thesame time reduce to a minimum the escape of heat through the flue. It isthus the object of my invention to providemeans for adapting an ordinaryhome furnace to a combustion of liquid fuels in an efficient manner; toprovide such means in the shape of an accessory vided within thecombustion chamber to increase the length of travel of the gases throughthe furnace before passing into the flue. It is a further object toprovide a baille and regenerator device in a manner to resist the greatheat `to which it is subjected within the combustion chamber.

Further and other advantages will be better apparent from a detaileddescription of the inven tion in connection with the Y accompanyingdrawing, in which:

Figure l is a vertical longitudinal section taken through a conventionaltype of hot air furnace showing my combined baille and regeneratordisposed within the combustion chamber thereof; Fig. 2 is a horizontalsection through the furnace taken on a plane indicated by the `line 2-2ofr Fig. 1; Fig. 3 is an enlarged vertical section taken on the line 3-3of Fig. 1 showing only a part of the combustion chamber and'my improveddevice positioned therein; Fig. 4 is a cross-sectional detail takenthrough the flue showing my damper arrangement for controlling theeffective passage therethrough; and Fig. 5 is a top planof the lfor thefurnace whereby a suitable baille is proi` that is comparatively simpleand is constructed baille shelf which supports thel bricks comprisingthe regenerator. i

Referring to the drawing, F represents an 'ordinary hot air furnaceandthe combustion chamber C in which is disposed a conventional `oil ffburner B. In thelowerpart of the furnacecom# prising theash pit A,when'the furnace utilizes solid fuel, I place a suitable standard Scomprising a tripod 1 having a socket 2 and a supporting staff 3disposed in said socket for the purpose of 'l' supporting the Vbailleshelf 6. The upper end of the shaft 3 terminates-in a cylindricalportion 4 which is adapted to enter socket 5 formed at the .l middleofthe semi-circular wall w of shelf 6. The:` n baille shelf 6 has adownwardly depending baille '7 at its forward edge and a plurality ofspaced cross-bars 8 extending between its margins for the purpose ofsupporting the checker-work 9 constituting the regenerator. It isapparent that the checker-work 9 blocksloffa large amount of 751` thefree space through the baille shelf so that the flaming particles andhot gases rising from the burner B will be deflected on encounteringsaid shelf and their path to the flue 10 will be more or lesscircuitous. VObviously, the checker-works@ 9 will become highly heatedsoV that when the flame is cut offthis check-work will give off its heat`by radiation to the combustion chamber and prevent a sudden coolingofthe furnace.

Obviously, the staff 3 and baille shelf 6 must 85'. withstandconsiderable heat, for which reasonA Y these parts are preferably madeof alloy steel con` taining chromium or nickel, or both, so that they"may maintain a high tensile strength at high temperatures. Such alloysare well known in the art and'arenot claimed herein.

In order that the drafts through the flue4 10 may be controlled a damperis provided compris-v ing a sleeve 11 insertible within the flue and a.l thimble 12 insertible into said sleeve 11. The 95v thimble opening 12is controlled by a swinging damper 13 having a hinge element 14`carriedby a hinge pin or bar 15 extended transversely of the thimble 12 nearits outer edge thereof. The thimble 12 is provided with a notch n to therear 100' of the hinge point of the damper 13 so that'even though thedamper 13 is closed products of cornbustion may escape into the fluethrough said notch. The damper 13 is suspended and is main- 1 tained ina closed position by its own weight so that when thel pressure withinthe combustion chamber C is excessive the damper Will be forced open toallow the accumulated products of combustion to rapidly escape throughthe flue 10.

Under normal operation the damper 13 will re- 1101 I Va ue leadingtherefrom, a valve thimble mounted in the flue and extending into thecombustion chamber, said thimble having a valve for controlling theescape of the products of combustion into the flue, said valve beingadapted for operation by the pressure of the products of combustionwithin the combustion chamber; and said thimble having a by-pass for theproducts of combustion disposed between the valve and the flue.

, JOHN WM. FRANZ.

